/Engine/Plugins/Runtime/Synthesis/Source/Synthesis/Classes/SynthComponents/EpicSynth1Component.h
Stop the note (will only do anything if a voice is playing with that note)
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Synth|Components|Audio") void NoteOff ( const float Note, const bool bAllNotesOff, const bool bKillAllNotes )